diff --git a/lib/rb/spec/struct_spec.rb b/lib/rb/spec/struct_spec.rb
index b09c7f6..bbd502b 100644
--- a/lib/rb/spec/struct_spec.rb
+++ b/lib/rb/spec/struct_spec.rb
@@ -227,7 +227,7 @@
     it "should support optional type-checking in Thrift::Struct.new" do
       Thrift.type_checking = true
       begin
-        expect { SpecNamespace::Hello.new(:greeting => 3) }.to raise_error(Thrift::TypeError, "Expected Types::STRING, received Fixnum for field greeting")
+        expect { SpecNamespace::Hello.new(:greeting => 3) }.to raise_error(Thrift::TypeError, /Expected Types::STRING, received (Integer|Fixnum) for field greeting/)
       ensure
         Thrift.type_checking = false
       end
@@ -238,7 +238,7 @@
       Thrift.type_checking = true
       begin
         hello = SpecNamespace::Hello.new
-        expect { hello.greeting = 3 }.to raise_error(Thrift::TypeError, "Expected Types::STRING, received Fixnum for field greeting")
+        expect { hello.greeting = 3 }.to raise_error(Thrift::TypeError, /Expected Types::STRING, received (Integer|Fixnum) for field greeting/)
       ensure
         Thrift.type_checking = false
       end
diff --git a/lib/rb/spec/types_spec.rb b/lib/rb/spec/types_spec.rb
index 364c2a7..d595ab5 100644
--- a/lib/rb/spec/types_spec.rb
+++ b/lib/rb/spec/types_spec.rb
@@ -100,9 +100,9 @@
     end
 
     it "should give the Thrift::TypeError a readable message" do
-      msg = "Expected Types::STRING, received Fixnum for field foo"
+      msg = /Expected Types::STRING, received (Integer|Fixnum) for field foo/
       expect { Thrift.check_type(3, {:type => Thrift::Types::STRING}, :foo) }.to raise_error(Thrift::TypeError, msg)
-      msg = "Expected Types::STRING, received Fixnum for field foo.element"
+      msg = /Expected Types::STRING, received (Integer|Fixnum) for field foo.element/
       field = {:type => Thrift::Types::LIST, :element => {:type => Thrift::Types::STRING}}
       expect { Thrift.check_type([3], field, :foo) }.to raise_error(Thrift::TypeError, msg)
       msg = "Expected Types::I32, received NilClass for field foo.element.key"